Re: [gentoo-science] tip for installing files from tarballs

[Andrew Ammerlaan]

On 09/02/2021 00:39, François Bissey wrote:
> It looks like “--no-same-owner” does work in the end.
> However, I bumped into a probably subtle bug in portage.
>
> Before the permission were right I had to un-merge the
> package (emerge -C …) first, then merge it again.
> It looks like the ownership is not changed if there are files
> from a previous install. Even if the new install has different
> ownership. It could be interesting to see if permission are
> affected as well.
>
I'm pretty sure this behavior is intentional and not a bug. If an user 
were to change the permissions/owner of some file to adapt it to his/her 
configuration and an update would overwrite this. Well that would lead 
to annoying breakage on this users system on every update/rebuild.

If an ebuild for whatever reason has to change the owner/permissions of 
an existing file I guess the pkg_postinst/pkg_preinst phases could be used.

>> On 9/02/2021, at 12:03, François Bissey <frp.bissey@×××××.com> wrote:
>>
>> Just for the record so that some root cause of the issue are more clear.
>>  From “man tar”
>>        --no-same-owner
>>               Extract files as yourself (default for ordinary users).
>>
>>
>>        --same-owner
>>               Try extracting files with the same ownership as exists in the archive (default for superuser).
>>
>> ======
>>
>> So, by default, when you emerge with root, tar will try to preserve ownership
>> as stated inside the tarball. I was hoping that inserting “—no-same-owner”
>> in the tar command would changes things a little bit. But for some reasons
>> it didn’t have any effect when I inserted it inside the makefile.
>>
>>> On 9/02/2021, at 11:55, François Bissey <frp.bissey@×××××.com> wrote:
>>>
>>> Nope, just plain emerge as root.
>>>
>>>> On 9/02/2021, at 11:55, Aisha Tammy <gentoo.science@×××××.cc> wrote:
>>>>
>>>> Are you installing/building with the ebuild command and then merging with sudo or
>>>> something similar?
>>>> That may be one reason something like this is happening.
>>>>
>>>> On 2/8/21 5:28 PM, François Bissey wrote:
>>>>> Hi all,
>>>>>
>>>>> I discovered an issue in a couple of packages for which sage-on-gentoo
>>>>> provides ebuilds.
>>>>> Some packages install data directly from a tar command. By that I mean
>>>>> Makefile.am will a line like
>>>>> cd $(DESTDIR)$(dbdir) && tar xf $(dist_db_DATA) && rm $(dist_db_DATA)
>>>>>
>>>>>  From a real Makefile at
>>>>> https://github.com/sagemath/p_group_cohomology/blob/master/present/Makefile.am
>>>>>
>>>>> I looks innocuous until you realise it has some funny effects on ownership.
>>>>> fbissey@moonloop ~ $ ll /usr/share/pGroupCohomology/
>>>>> total 1.1M
>>>>> drwxr-xr-x 270 root    root     12K Feb  3 21:55 .
>>>>> drwxr-xr-x 319 root    root     12K Feb  3 21:55 ..
>>>>> drwxr-xr-x   3 fbissey fbissey 4.0K Feb  9 10:46 64gp1
>>>>> drwxr-xr-x   4 fbissey fbissey 4.0K Feb  9 10:46 64gp10
>>>>> drwxr-xr-x   4 fbissey fbissey 4.0K Feb  9 10:46 64gp100
>>>>> drwxr-xr-x   4 fbissey fbissey 4.0K Feb  9 10:46 64gp101
>>>>> drwxr-xr-x   4 fbissey fbissey 4.0K Feb  9 10:46 64gp102
>>>>>
>>>>> the files in the tarball are owned by user/group 1001:1001
>>>>> and on my system it is my personal user.
>>>>> sci-mathematics/singular and that may include the version in the main tree,
>>>>> would have to check, install its documentation from a tarball as well
>>>>> fbissey@moonloop ~ $ ll /usr/share/doc/singular-4.1.1_p2-r3/
>>>>> total 216K
>>>>> drwxr-xr-x    3 2345 uucp 4.0K Nov 10 10:49 .
>>>>> drwxr-xr-x 1361 root root  64K Feb  9 10:39 ..
>>>>> drwxr-xr-x    2 2345 uucp 128K Nov 10 10:49 html
>>>>> -rw-r--r--    1 root root  497 Nov 10 10:48 README.bz2
>>>>> -rw-r--r--    1 root root  517 Nov 10 10:48 README.md.bz2
>>>>> -rw-r--r--    1 root root  585 Nov 10 10:48 README.pkg.bz2
>>>>> fbissey@moonloop ~ $ ll /usr/share/doc/singular-4.1.1_p2-r3/html
>>>>> total 30M
>>>>> drwxr-xr-x 2 2345 uucp 128K Nov 10 10:49  .
>>>>> drwxr-xr-x 3 2345 uucp 4.0K Nov 10 10:49  ..
>>>>> -rwxr-xr-x 1 2345 uucp  915 Feb 14  2018  a_begin.gif
>>>>> -rwxr-xr-x 1 2345 uucp  909 Feb 14  2018  a_begin_na.gif
>>>>> -rwxr-xr-x 1 2345 uucp  927 Feb 14  2018  a_document.gif
>>>>>
>>>>> I tried to use fowners inside the ebuild, but it only fixes file ownership,
>>>>> folders are not touched. I tried to insert “—no-same-owner” in the call to tar
>>>>> and that didn’t really help either. At best, I am expecting ownership to change
>>>>> to portage:portage.
>>>>>
>>>>> Has anyone dealt with something like this before? Apart from “recursively”
>>>>> scripting install in the make file is there anything simple I could do?
>>>>>
>>>>> Cheers,
>>>>> François
>>>>
>>>
>>
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